WO2024087482A1

WO2024087482A1 - Sound production component

Info

Publication number: WO2024087482A1
Application number: PCT/CN2023/083536
Authority: WO
Inventors: 张磊; 顾善勇; 赵洪强; 童珮耕; 解国林; 李永坚; 徐江; 招涛; 武多多; 戢澳; 齐心
Original assignee: 深圳市韶音科技有限公司; 精拓丽音科技（北京）有限公司
Priority date: 2022-10-28
Filing date: 2023-03-24
Publication date: 2024-05-02
Also published as: CN220108162U; CN220067644U; CN220511241U; CN117956343A; CN117956347A; WO2024087444A1; EP4456555A1; CN220210580U; US20240147161A1; CN117956356A; CN220368781U; CN221409082U; CN220823261U; CN117956344A; CN220528214U; CN220254651U; TW202418825A; TW202418822A; TW202418852A; CN220528194U

Abstract

One or more embodiments of the present description relate to a sound production component, comprising: a diaphragm, a magnetic circuit assembly, and a coil, wherein the coil is connected to the diaphragm and is at least partially located in a magnetic gap formed by the magnetic circuit assembly; after the coil is energized, the coil drives the diaphragm to vibrate so as to produce sound; the diaphragm comprises a main body region and a corrugated ring region provided around the main body region; the main body region comprises a first inclined segment and a first connecting segment connected to the coil; the first inclined segment is attached to a part of the corrugated ring region; and the first inclined segment inclines in the direction away from the coil relative to the first connecting segment.

Description

A vocal part

cross reference

This application claims priority to the Chinese application with application number 202211336918.4 filed on October 28, 2022, priority to the Chinese application with application number 202223239628.6 filed on December 01, 2022, and priority to the international application with application number PCT/CN2022/144339 filed on December 30, 2022, all of which are incorporated herein by reference.

Technical Field

The present invention relates to the field of acoustics, and in particular to a sound-generating part.

Background technique

With the development of acoustic output technology, sound-emitting parts (e.g., headphones) have been widely used in people's daily lives. They can be used in conjunction with electronic devices such as mobile phones and computers to provide users with an auditory feast. The output performance of the sound-emitting part has a great impact on the user's comfort. The structure of the diaphragm in the sound-emitting part and the supporting structure that cooperates with the diaphragm usually affect the output performance of the sound-emitting part. Therefore, it is necessary to propose a sound-emitting part with high output performance.

Summary of the invention

An embodiment of the present specification provides a sound-emitting part, including: a diaphragm; a magnetic circuit assembly; and a coil, wherein the coil is connected to the diaphragm and is at least partially located in a magnetic gap formed by the magnetic circuit assembly, and when energized, the coil drives the diaphragm to vibrate to generate sound, wherein the diaphragm includes a main body area and a folded ring area arranged around the main body area, the main body area includes a first inclined section and a first connecting section connected to the coil, the first inclined section is in contact with a portion of the folded ring area, and the first inclined section is inclined relative to the first connecting section in a direction away from the coil.

In some embodiments, the fold area includes a second inclined segment, and the second inclined segment is at least partially aligned with the first inclined segment.

In some embodiments, the second inclined section is located on a side of the first inclined section facing away from the coil.

In some embodiments, the folding ring area includes an arc segment, and the ratio of the height of the arc segment to the span of the arc segment is in the range of 0.35-0.4.

In some embodiments, an inclination angle of the first inclined section relative to the first connecting section is in the range of 5°-30°, and the first connecting section is perpendicular to the vibration direction of the diaphragm.

In some embodiments, the main body area includes a spherical top, which is located at an end of the first connecting section away from the first inclined section, the span of the spherical top is in the range of 2mm-8mm, and the height of the spherical top is in the range of 0.7mm-1.2mm.

In some embodiments, the ratio of the height of the dome to the span is in the range of 0.1-0.3.

In some embodiments, the frequency at which the high frequency split vibration occurs is no less than 20 kHz.

In some embodiments, the magnetic circuit assembly includes a housing, and at an input voltage of 0.1V-0.7V, a distance from the bottom of the coil to the bottom of the housing is in the range of 0.8mm-0.9mm in the frequency range of 20Hz-6.1kHz.

In some embodiments, the sound-emitting portion further includes a bracket disposed around the magnetic circuit assembly, and a first portion of the bracket is connected to a second connecting section of the folding ring area.

In some embodiments, the second connecting section of the folding ring area is connected to the first part of the bracket through a fixing ring.

In some embodiments, the thickness of the first part where the bracket is connected to the folding ring area is in the range of 0.3mm-3mm, and the thickness of the first part is the minimum distance between the connection area between the bracket and the folding ring area and the area where the bracket is directly in contact with the magnetic circuit assembly in the vibration direction of the diaphragm.

In some embodiments, the sound-emitting part further includes a shell, a pressure relief hole is provided on the shell, a rear cavity is formed between the pressure relief hole and the back surface of the diaphragm, and a resonance frequency of the rear cavity is not less than 3.3 kHz.

In some embodiments, the volume of the back cavity is in the range of 60 mm ³ -110 mm ³ .

In some embodiments, the sound-emitting part also includes a shell, the shell is provided with a pressure relief hole, and the bracket is provided with a plurality of air holes, and the sound from the back of the diaphragm is transmitted to the pressure relief hole through the plurality of air holes, and the plurality of air holes include at least a first air hole and a second air hole, and the distance between the center of the first air hole and the center of the pressure relief hole is greater than the distance between the center of the second air hole and the center of the pressure relief hole, and the area of the first air hole is greater than the area of the second air hole.

In some embodiments, the sound-emitting part also includes a shell, the shell is provided with a pressure relief hole, the bracket starts with a plurality of air holes, the sound from the back of the diaphragm is transmitted to the pressure relief hole through the plurality of air holes, and in the vibration direction of the diaphragm, the ratio of the total area of the plurality of air holes to the projection area of the diaphragm is in the range of 0.008-0.3.

In some embodiments, in the vibration direction of the diaphragm, the projected area of the diaphragm is in the range of 90 mm ² -560 mm ² , and the total area of the plurality of air holes is in the range of 4.54 mm ² -12.96 mm ² .

In some embodiments, the sound-emitting part further includes a shell, and in the vibration direction of the diaphragm, the ratio of the projected area of the diaphragm to the projected area of the shell is not less than 0.5.

In some embodiments, in the vibration direction of the diaphragm, a ratio of a projected area of the diaphragm to a projected area of the shell is in the range of 0.8-0.95.

In some embodiments, the major axis dimension of the diaphragm is in the range of 13 mm to 25 mm, and the minor axis dimension of the diaphragm is in the range of 4 mm to 13 mm.

In some embodiments, a plurality of ventilation holes are provided on the bottom wall of the container of the magnetic circuit assembly or on the side wall in contact with the bracket.

In some embodiments, the dome is formed by interlacing carbon fibers, and at least a portion of the carbon fibers are interlaced at a first angle, and the first angle is in the range of 45°-90°.

In some embodiments, in the vibration direction of the diaphragm, the thickness of the dome is less than 80 um.

In some embodiments, a minimum distance between the coil and the first inclined segment is not less than 0.3 mm.

In some embodiments, the magnetic circuit assembly includes a magnetic conductive plate and a magnet, wherein the magnetic conductive plate is located between the magnet and the diaphragm and attached to the surface of the magnet, and in the vibration direction of the diaphragm, the distance between the center of the coil and the center of the magnetic conductive plate is less than 0.3 mm.

In some embodiments, in the vibration direction of the diaphragm, the distance from the lowest point of the spherical top to the upper surface of the magnetic conductive plate is greater than 0.8 mm.

In some embodiments, the magnetic circuit assembly includes a housing, and in the vibration direction of the diaphragm, the distance between the bottom of the coil and the bottom wall of the housing is in the range of 0.2 mm-4 mm.

In some embodiments, the distance between the coil and the side wall of the container is in the range of 0.1 mm-0.5 mm.

BRIEF DESCRIPTION OF THE DRAWINGS

This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

FIG. 1 is a schematic diagram of an exemplary ear according to some embodiments of the present application;

FIG2 is an exemplary wearing diagram of an open-type headset according to some embodiments of this specification;

FIG3 is an exemplary wearing diagram of an open-type headset according to some embodiments of this specification;

FIG4 is an exemplary wearing diagram of another open-type earphone according to some embodiments of the present specification;

FIG5 is a schematic diagram of an exemplary distribution of a cavity structure arranged around one of the dual sound sources according to some embodiments of this specification;

FIG6 is a schematic diagram of an exemplary internal structure of a sound-generating part according to some embodiments of the present specification;

FIG7 is an exemplary external view of a transducer according to some embodiments of the present specification;

FIG8 is an exemplary exploded view of a transducer according to some embodiments of the present specification;

FIG9 is an exemplary internal structure diagram of a sound-producing part according to some embodiments of the present specification;

FIG10 is an exemplary structural diagram of a diaphragm according to some embodiments of the present specification;

FIG11A is a schematic diagram of an exemplary high-frequency bandwidth of a sound-emitting part according to some embodiments of the present specification;

FIG. 11B is a schematic diagram of an exemplary braided structure of carbon fibers according to some embodiments of the present specification;

FIG12 is a schematic diagram of the amplitude of the sound-emitting part under different driving voltages according to some embodiments of this specification;

FIG13 is an exemplary structural diagram of a rear cavity according to some embodiments of the present specification;

FIG14 is a frequency response curve diagram of the rear cavity corresponding to different thicknesses of the first portion according to some embodiments of the present specification;

FIG. 15 is a frequency response curve diagram of the sound-emitting part under different driving voltages according to some embodiments of the present specification;

FIG. 16 is a schematic diagram of exemplary positions of a bracket, a first pressure relief hole, and a second pressure relief hole according to some embodiments of this specification; and

FIG. 17 is a frequency response curve of the rear cavity corresponding to different total areas of air holes according to some embodiments of the present specification.

Detailed ways

In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, without paying creative work, this specification can also be applied to other similar scenarios based on these drawings. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

It should be understood that the "system", "device", "unit" and/or "module" used herein are a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

As shown in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and/or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprises" and "includes" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

In the description of this specification, it should be understood that the terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", "third", "fourth" may explicitly or implicitly include at least one of the features. In the description of this specification, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In this specification, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, the term "connection" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, it can refer to the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this specification can be understood according to the specific circumstances.

Flowcharts are used in this specification to illustrate the operations performed by the system according to the embodiments of this specification. It should be understood that the preceding or following operations are not necessarily performed precisely in order. Instead, the steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes.

FIG. 1 is a schematic diagram of an exemplary ear according to some embodiments of the present application. Referring to FIG. 1 , the ear 100 may include an external auditory canal 101, a cavity concha 102, a cymba concha 103, a triangular fossa 104, an antihelix 105, a scaphoid 106, an auricle 107, an earlobe 108, and an auricle crus 109. In some embodiments, the wearing and stabilization of an acoustic device may be achieved with the aid of one or more parts of the ear 100. In some embodiments, the external auditory canal 101, the cavity concha 102, the cymba concha 103, the triangular fossa 104, and other parts have a certain depth and volume in three-dimensional space, which can be used to achieve the wearing requirements of the acoustic device. For example, an acoustic device (e.g., an in-ear headset) can be worn in the external auditory canal 101. In some embodiments, the wearing of an acoustic device may be achieved with the aid of other parts of the ear 100 other than the external auditory canal 101. For example, the wearing of an acoustic device may be achieved with the aid of the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, the auricle 107, and other parts or a combination thereof. In some embodiments, in order to improve the comfort and reliability of the acoustic device in wearing, it is also possible to further use the user's earlobe 108 and other parts. By using other parts of the ear 100 other than the external auditory canal 101 to achieve the wearing of the acoustic device and the propagation of sound, the user's external auditory canal 101 can be "liberated" and the impact of the acoustic device on the user's ear health can be reduced. When the user wears the acoustic device on the road, the acoustic device will not block the user's external auditory canal 101. The user can receive both the sound from the acoustic device and the sound from the environment (for example, horns, car bells, surrounding human voices, traffic control sounds, etc.), thereby reducing the probability of traffic accidents. For example, when the user wears the acoustic device, the entire or partial structure of the acoustic device can be located on the front side of the helix crus 109 (for example, the area J surrounded by the dotted line in Figure 1). For another example, when the user wears the acoustic device, the entire or partial structure of the acoustic device may contact the upper part of the external auditory canal 101 (for example, the location of one or more parts such as the crus helix 109, the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, the helix 107, etc.). For another example, when the user wears the acoustic device, the entire or partial structure of the acoustic device may be located in one or more parts of the ear (for example, the cavum concha 102, the cymba concha 103, the triangular fossa 104, etc.) (for example, the areas _M1 and _M2 surrounded by dotted lines in FIG. 1 ).

Different users may have individual differences, resulting in different shapes, sizes and other dimensional differences in the ears. For the sake of ease of description and understanding, if not otherwise specified, this manual will mainly use an ear model with a "standard" shape and size as a reference to further describe how the acoustic device in different embodiments is worn on the ear model. For example, a simulator containing a head and its (left and right) ears made based on ANSI: S3.36, S3.25 and IEC: 60318-7 standards, such as GRAS KEMAR, HEAD Acoustics, B&K 4128 series or B&K 5128 series, can be used as a reference for wearing an acoustic device, thereby presenting a scenario in which most users normally wear the acoustic device. Taking GRAS KEMAR as an example, the ear simulator can be any one of GRAS 45AC, GRAS45BC, GRAS 45CC or GRAS 43AG. Taking HEAD Acoustics as an example, the ear simulator It can be any one of HMS II.3, HMS II.3LN or HMS II.3LN HEC. It should be noted that the data range measured in the embodiments of this specification is measured on the basis of GRAS 45BC KEMAR, but it should be understood that there may be differences between different head models and ear models, and the relevant data range may fluctuate by ±10% when using other models. Just as an example, the ear used as a reference can have the following relevant characteristics: the size of the projection of the auricle on the sagittal plane in the vertical axis direction can be in the range of 49.5mm-74.3mm, and the size of the projection of the auricle on the sagittal plane in the sagittal axis direction can be 36.6mm-55mm. The projection of the auricle on the sagittal plane refers to the projection of the edge of the auricle on the sagittal plane. The edge of the auricle is composed of at least the outer contour of the helix, the earlobe contour, the tragus contour, the intertragus notch, the antitragus cusp, the annular tragus notch, etc. Therefore, in the present application, descriptions such as "user wears", "in a wearing state" and "in a wearing state" may refer to the acoustic device described in the present application being worn on the ear of the aforementioned simulator. Of course, considering the individual differences among different users, the structure, shape, size, thickness, etc. of one or more parts of the ear 100 may be differentially designed according to ears of different shapes and sizes. These differentiated designs may be manifested as characteristic parameters of one or more parts of the acoustic device (for example, the sound-emitting part, ear hook, etc. described below) having different ranges of values to adapt to different ears.

It should be noted that in the fields of medicine and anatomy, three basic planes of the human body can be defined: the sagittal plane, the coronal plane, and the horizontal plane, as well as three basic axes: the sagittal axis, the coronal axis, and the vertical axis. Among them, the sagittal plane refers to a plane perpendicular to the ground along the front-to-back direction of the body, which divides the human body into left and right parts; the coronal plane refers to a plane perpendicular to the ground along the left-to-right direction of the body, which divides the human body into front and back parts; the horizontal plane refers to a plane parallel to the ground along the vertical direction perpendicular to the body, which divides the human body into upper and lower parts. Correspondingly, the sagittal axis refers to an axis along the front-to-back direction of the body and perpendicular to the coronal plane, the coronal axis refers to an axis along the left-to-right direction of the body and perpendicular to the sagittal plane, and the vertical axis refers to an axis along the up-down direction of the body and perpendicular to the horizontal plane. Furthermore, the "front side of the ear" mentioned in the present application refers to the side of the ear that is along the sagittal axis and is located toward the human face area. When the ear of the simulator is observed along the direction of the human coronal axis, the front side outline diagram of the ear shown in FIG1 can be obtained.

The description of the ear 100 is for illustrative purposes only and is not intended to limit the scope of the present application. A person skilled in the art can make various changes and modifications based on the description of the present application. For example, a partial structure of the acoustic device can shield part or all of the external auditory canal 101. These changes and modifications are still within the scope of protection of the present application.

Figure 2 is an exemplary wearing diagram of an open-type headset according to some embodiments of this specification, Figure 3 is an exemplary wearing diagram of an open-type headset according to some embodiments of this specification, and Figure 4 is an exemplary wearing diagram of another open-type headset according to some embodiments of this specification. In some embodiments, the open-type headset 10 may include but is not limited to air conduction headsets and bone air conduction headsets. In some embodiments, the open-type headset 10 can be combined with products such as glasses, headphones, head-mounted display devices, AR/VR helmets, etc. As shown in Figures 2-4, the open-type headset 10 may include a sound-emitting part 11 and an ear hook 12. In some embodiments, the open-type headset 10 can wear the sound-emitting part 11 on the user's body (for example, the head, neck, or upper torso of the human body) through the ear hook 12.

In some embodiments, when the open earphone 10 is in the wearing state, the first part of the ear hook 12 is hung between the user's auricle and the head, and the second part extends to the side of the auricle away from the head and connects to the sound-emitting part 11, which is used to fix the sound-emitting part 11 near the ear canal but not blocking the ear canal. In some embodiments, the ear hook 12 can be an arc structure that matches the user's auricle, so that the ear hook 12 can be hung at the user's upper auricle. In some embodiments, the ear hook 12 can also be a clamping structure that matches the user's auricle, so that the ear hook 12 can be clamped at the user's auricle. In some embodiments, the ear hook 12 can include but is not limited to a hook structure, an elastic band, etc., so that the open earphone 10 can be better fixed to the user to prevent the user from falling off during use.

In some embodiments, the sound-emitting portion 11 can be worn on the user's body, and a transducer (e.g., transducer 112) can be provided in the sound-emitting portion 11 to generate sound input to the user's ear 100. In some embodiments, the open-type earphone 10 can be combined with products such as glasses, headphones, head-mounted display devices, AR/VR helmets, etc. In this case, the sound-emitting portion 11 can be worn near the user's ear 100 in a hanging or clamping manner. In some embodiments, the sound-emitting portion 11 can be in the shape of a ring, an ellipse, a polygon (regular or irregular), a U-shape, a V-shape, or a semicircle, so that the sound-emitting portion 11 can be directly hung on the user's ear 100.

In conjunction with Figures 1 and 2, in some embodiments, when the user wears the open earphones 10, at least part of the sound-emitting part 11 may be located in area J on the front side of the tragus of the user's ear 100 shown in Figure 1 or in areas M1 and M2 inside the auricle. The following will be exemplified in conjunction with different wearing positions of the sound-emitting part 11 (11A, 11B, and 11C shown in Figure 2). It should be noted that the anterior and lateral side of the auricle mentioned in the embodiments of this specification refers to the side of the auricle away from the head along the coronal axis, and correspondingly, the posterior and medial side of the auricle refers to the side of the auricle facing the human head along the coronal axis. In some embodiments, the sound-emitting part 11 is located at 11A, which means that the sound-emitting part 11 is located on the side of the user's ear 100 facing the human facial area along the sagittal axis, that is, the sound-emitting part 11 is located in area J on the front side of the ear 100.

Furthermore, a transducer (e.g., transducer 112) is disposed inside the shell of the sound-emitting part 11, and at least one sound outlet hole (e.g., sound outlet hole 111a, not shown in FIG. 2) may be disposed on the shell of the sound-emitting part 11 (e.g., shell 111), and the sound outlet hole may be located on a side wall of the shell of the sound-emitting part facing or close to the external auditory canal 101 of the user, and the transducer may output the sound to the external auditory canal 101 of the user through the sound outlet hole. The transducer is a component that can receive an electrical signal and convert it into a sound signal for output. In some embodiments, the type of transducer 112 can include a low-frequency (e.g., 30Hz-150Hz) speaker, a medium-low frequency (e.g., 150Hz-500Hz) speaker, a medium-high frequency (e.g., 500Hz-5kHz) speaker, a high-frequency (e.g., 5kHz-16kHz) speaker, or a full-frequency (e.g., 30Hz-16kHz) speaker, or any combination thereof, according to the frequency. The low frequency, high frequency, etc. mentioned here only represent the approximate range of frequency, and different division methods can be used in different application scenarios. For example, a crossover point can be determined, the low frequency represents the frequency range below the crossover point, and the high frequency represents the frequency above the crossover point. The crossover point can be any value within the audible range of the human ear, for example, 500Hz, 600Hz, 700Hz, 800Hz, 1000Hz, etc.

In some embodiments, the transducer may include a diaphragm (e.g., diaphragm 1121). When the diaphragm vibrates, sound may be emitted from the front and rear sides of the diaphragm, respectively. The chamber inside the shell of the sound-emitting portion 11 is divided by the diaphragm into at least a front chamber (e.g., front chamber 114) located in front of the diaphragm and a rear chamber (e.g., rear chamber 116) located behind the diaphragm. The sound outlet is acoustically coupled with the front chamber. The vibration of the diaphragm drives the air in the front chamber to vibrate to produce air-conducted sound. The air-conducted sound produced by the front chamber is transmitted to the outside through the sound outlet. In some embodiments, the shell of the sound-emitting portion 11 may also include one or more pressure relief holes (e.g., a first pressure relief hole 111c and a second pressure relief hole 111d). The pressure relief hole may be located on a side wall of the shell adjacent to or opposite to the side wall where the sound outlet is located. The pressure relief hole is acoustically coupled with the rear chamber. When the diaphragm vibrates, it also drives the air in the rear chamber to vibrate to produce air-conducted sound. The air-conducted sound produced by the rear chamber may be transmitted to the outside through the pressure relief hole. Exemplarily, in some embodiments, the transducer in the sound-emitting part 11 can output sound with a phase difference (for example, opposite phase) through the sound outlet hole and the pressure relief hole. The sound outlet hole can be located on the side wall of the shell of the sound-emitting part 11 facing the external auditory canal 101 of the user, and the pressure relief hole can be located on the side of the shell of the sound-emitting part 11 away from the external auditory canal 101 of the user. At this time, the shell can act as a baffle to increase the sound path difference between the sound outlet hole and the pressure relief hole to the external auditory canal 101, so as to increase the sound intensity at the external auditory canal 101 while reducing the volume of far-field sound leakage.

In some embodiments, the sound-emitting part 11 may have a long axis direction Y and a short axis direction Z that are perpendicular to the thickness direction X and orthogonal to each other. Among them, the long axis direction Y can be defined as the direction with the largest extension dimension in the shape of the two-dimensional projection surface of the sound-emitting part 11 (for example, the projection of the sound-emitting part 11 on the plane where its outer side surface is located, or the projection on the sagittal plane) (for example, when the projection shape is a rectangle or an approximate rectangle, the long axis direction is the length direction of the rectangle or the approximate rectangle), and the short axis direction Z can be defined as the direction perpendicular to the long axis direction Y in the shape of the projection of the sound-emitting part 11 on the sagittal plane (for example, when the projection shape is a rectangle or an approximate rectangle, the short axis direction is the width direction of the rectangle or the approximate rectangle). The thickness direction X can be defined as a direction perpendicular to the two-dimensional projection surface, for example, consistent with the direction of the coronal axis, both pointing to the left and right directions of the body. In some embodiments, when the sound-emitting part 11 is in a tilted state in the wearing state, the long axis direction Y and the short axis direction Z are still parallel or approximately parallel to the sagittal plane, and the long axis direction Y can have a certain angle with the direction of the sagittal axis, that is, the long axis direction Y is also tilted accordingly, and the short axis direction Z can have a certain angle with the direction of the vertical axis, that is, the short axis direction Z is also tilted, as shown in FIG. 2 , the sound-emitting part 11 is worn on 11B, and FIG. 4 shows the wearing state of the sound-emitting part 11. In some embodiments, the whole or part of the structure of the sound-emitting part 11 can extend into the concha cavity, that is, the projection of the sound-emitting part 11 on the sagittal plane and the projection of the concha cavity on the sagittal plane have an overlapping part. For the specific content of the sound-emitting part 11 being worn on 11B, please refer to the content elsewhere in this specification, for example, FIG. 3 and its corresponding specification content. In some embodiments, the sound-emitting part 11 may also be in a horizontal state or an approximately horizontal state in the wearing state, as shown in the sound-emitting part 11 of FIG. 2 worn at 11C and the sound-emitting part 11 shown in FIG. 3 , the long axis direction Y may be consistent or approximately consistent with the direction of the sagittal axis, both pointing to the front and back direction of the body, and the short axis direction Z may be consistent or approximately consistent with the direction of the vertical axis, both pointing to the up and down direction of the body. It should be noted that in the wearing state, the sound-emitting part 11 being in an approximately horizontal state may mean that the angle between the long axis direction of the sound-emitting part 11 shown in FIG. 2 and the sagittal axis is within a specific range (for example, not more than 20°). In addition, the wearing position of the sound-emitting part 11 is not limited to 11A, 11B and 11C shown in FIG. 2 , and it only needs to satisfy the area J, area M1 or area M2 shown in FIG. 1 . For example, the entire or partial structure of the sound-emitting part 11 may be located in the area J surrounded by the dotted line in FIG. 1 . For another example, the whole or part of the structure of the sound-generating part 11 may be in contact with the position where one or more parts of the external auditory canal 101, such as the crus helix 109, the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, and the helix 107, are located. For another example, the whole or part of the structure of the sound-generating part 11 may be located in a cavity formed by one or more parts of the ear 100 (e.g., the cavum concha 102, the cymba concha 103, the triangular fossa 104, etc.) (e.g., the area M1 enclosed by the dotted line in FIG. 1 at least including the cymba concha 103 and the triangular fossa 104, and the area M2 at least including the cavum concha 102).

In some embodiments, in order to improve the stability of the open earphone 10 in the wearing state, the open earphone 10 can adopt any one of the following methods or a combination thereof. For example, at least a portion of the ear hook 12 is configured as a contoured structure that fits at least one of the back side of the ear and the head, so as to increase the contact area between the ear hook 12 and the ear and/or the head, thereby increasing the resistance of the open earphone 10 to fall off the ear. For example, at least a portion of the ear hook 12 is configured as an elastic structure so that it has a certain amount of deformation in the wearing state, so as to increase the positive pressure of the ear hook 12 on the ear and/or the head, thereby increasing the resistance of the open earphone 10 to fall off the ear. For example, at least a portion of the ear hook 12 is configured to abut against the head in the wearing state, so as to form a reaction force that presses the ear, so that the sound-emitting portion 11 is pressed against the front side of the ear, thereby increasing the resistance of the open earphone 10 to fall off the ear. For example, the sound-emitting part 11 and the ear hook 12 are configured to clamp the physiological parts such as the area where the antihelix is located and the area where the concha cavity is located from the front and back sides of the ear when worn, thereby increasing the resistance of the open earphone 10 to fall off the ear. The earplugs extend into physiological parts such as the concha cavity, the cymba concha, the triangular fossa and the scaphoid, thereby increasing the resistance of the open earphone 10 to fall off from the ear.

The sound-emitting part 11 may have a connection end CE connected to the ear hook 12 and a free end FE not connected to the ear hook 12. For example, in conjunction with FIG. 4 , in the wearing state, the free end FE of the sound-emitting part 11 may extend into the concha cavity. Optionally, the sound-emitting part 11 and the ear hook 12 may be configured to clamp the ear region corresponding to the concha cavity from the front and back sides of the ear region, thereby increasing the resistance of the open-type earphone 10 to fall off the ear, thereby improving the stability of the open-type earphone 10 in the wearing state. For example, the free end FE of the sound-emitting part is pressed in the concha cavity in the thickness direction X. For another example, the free end FE abuts in the concha cavity in the long axis direction Y and/or the short axis direction Z (for example, abuts against the inner wall of the concha cavity relative to the free end FE). Among them, the free end FE of the sound-emitting part 11 refers to the end of the sound-emitting part 11 that is arranged opposite to the fixed end connected to the ear hook 12. The sound-emitting part 11 may be a regular or irregular structure, and an exemplary description is given here to further illustrate the free end FE of the sound-emitting part 11. For example, when the sound-emitting part 11 is a rectangular parallelepiped structure, the end wall surface of the sound-emitting part 11 is a plane, and the free end FE of the sound-emitting part 11 is an end side wall of the sound-emitting part 11 that is arranged opposite to the fixed end connected to the ear hook 12. For another example, when the sound-emitting part 11 is a sphere, an ellipsoid or an irregular structure, the free end FE of the sound-emitting part 11 may refer to a specific area away from the fixed end obtained by cutting the sound-emitting part 11 along the Y-Z plane (the plane formed by the short axis direction Z and the thickness direction X). It should be noted that: in the wearing state, in addition to extending into the concha cavity, the free end FE of the sound-emitting part 11 may also be projected onto the antihelix, or onto the left and right sides of the head and located on the front side of the ear on the sagittal axis of the human body. In other words, the ear hook 12 can support the sound-emitting part 11 to be worn in the concha cavity, the antihelix, the front side of the ear and other wearing positions.

The open earphone 10 shown in Fig. 4 is taken as an example to explain the open earphone 10 in detail. It should be noted that the structure and corresponding parameters of the open earphone 10 in Fig. 4 can also be applied to the open earphones of other configurations mentioned above without violating the corresponding acoustic principles.

By extending at least part of the sound-emitting part 11 into the concha cavity, the listening volume at the listening position (for example, at the opening of the ear canal), especially the listening volume of the mid-low frequency, can be increased, while still maintaining a good far-field sound leakage cancellation effect. As an exemplary illustration only, when the entire or partial structure of the sound-emitting part 11 is extended into the concha cavity, the sound-emitting part 11 and the concha cavity form a structure similar to a cavity (hereinafter referred to as a quasi-cavity). In the embodiments of the specification, the quasi-cavity can be understood as a semi-enclosed structure surrounded by the side walls of the sound-emitting part 11 and the concha cavity structure. The semi-enclosed structure is not completely sealed and isolated from the external environment, but has a leakage structure (for example, an opening, a gap, a pipe, etc.) that is acoustically connected to the external environment. When the user wears the open-type earphone 10, one or more sound outlet holes may be provided on the side of the shell of the sound-emitting part 11 close to or facing the user's ear canal, and one or more pressure relief holes may be provided on the other side walls of the shell of the sound-emitting part 11 (for example, the side walls away from or away from the user's ear canal). The sound outlet holes are acoustically coupled with the front cavity of the open-type earphone 10, and the pressure relief holes are acoustically coupled with the back cavity of the open-type earphone 10. Taking the example that the sound-emitting part 11 includes a sound outlet hole and a pressure relief hole, the sound output by the sound outlet hole and the sound output by the pressure relief hole can be approximately regarded as two sound sources, and the sound waves of the two sound sources are in opposite phases. The inner wall corresponding to the sound-emitting part 11 and the concha cavity forms a cavity-like structure, wherein the sound source corresponding to the sound outlet hole is located inside the cavity-like structure, and the sound source corresponding to the pressure relief hole is located outside the cavity-like structure, forming the acoustic model shown in FIG5 .

FIG5 is an exemplary distribution diagram of a cavity structure arranged around one of the dual sound sources shown in some embodiments of the present specification. As shown in FIG5 , the cavity-like structure 502 may include a listening position and at least one sound source 501A. Here, “include” may mean that at least one of the listening position and the sound source 501A is inside the cavity-like structure 502, or may mean that at least one of the listening position and the sound source 501A is at the inner edge of the cavity-like structure 502. The listening position may be equivalent to the entrance of the ear canal, or may be an acoustic reference point of the ear, such as the ear reference point (ERP), the ear-drum reference point (DRP), etc., or may be an entrance structure leading to the listener, etc. Since the sound source 501A is wrapped by the cavity-like structure 502, most of the sound radiated by it will reach the listening position by direct or reflected means. In contrast, in the absence of the cavity-like structure 502, most of the sound radiated by the sound source 501A will not reach the listening position. Therefore, the setting of the cavity structure significantly increases the volume of the sound reaching the listening position. At the same time, only a small part of the anti-phase sound radiated by the anti-phase sound source 501B outside the cavity-like structure 502 will enter the cavity-like structure 502 through the leakage structure 503 of the cavity-like structure 502. This is equivalent to generating a secondary sound source 501B' at the leakage structure 503, whose intensity is significantly smaller than that of the sound source 501B and also significantly smaller than that of the sound source 501A. The sound generated by the secondary sound source 501B' has a weak anti-phase cancellation effect on the sound source 501A in the cavity, which significantly increases the listening volume at the listening position. For sound leakage, the sound source 501A radiates sound to the outside through the leakage structure 503 of the cavity, which is equivalent to generating a secondary sound source 501A' at the leakage structure 503. Since almost all the sound radiated by the sound source 501A is output from the leakage structure 503, and the scale of the cavity-like structure 502 is much smaller than the spatial scale of the sound leakage evaluation (at least one order of magnitude difference), it can be considered that the intensity of the secondary sound source 501A' is equivalent to that of the sound source 501A. For the external space, the secondary sound source 501A' and the sound source 501B form a dual sound source to cancel each other and reduce the sound leakage.

In a specific application scenario, the outer wall surface of the shell of the sound-emitting part 11 is usually a plane or a curved surface, and the contour of the user's concha cavity 102 is an uneven structure. By extending part or all of the sound-emitting part 11 into the concha cavity, a cavity-like structure connected to the outside is formed between the sound-emitting part 11 and the contour of the concha cavity. Furthermore, the sound outlet is arranged in the shell of the sound-emitting part 11 toward the user's ear canal opening and By arranging the pressure relief hole near the edge of the concha cavity 102 and at a position where the sound-emitting part 11 is away from or far away from the ear canal opening, the acoustic model shown in FIG. 5 can be constructed, thereby enabling the user to improve the listening position at the ear opening when wearing the open earphones 10 and reduce the sound leakage effect in the far field.

FIG6 is a schematic diagram of an exemplary internal structure of a sound-emitting part according to some embodiments of the present specification. As shown in FIG6, in some embodiments, the sound-emitting part 11 may include a transducer 112 and a shell 111 accommodating the transducer 112, and the transducer 112 may include a diaphragm 1121. A front cavity 114 located at the front side of the diaphragm 1121 and a rear cavity 116 located at the rear side of the diaphragm 1121 may be formed between the diaphragm 1121 and the shell 111. The shell 111 is provided with a sound outlet hole 111a acoustically coupled to the front cavity 114 and a pressure relief hole acoustically coupled to the rear cavity 116 (for example, a first pressure relief hole 111c and a second pressure relief hole 111d, wherein the second pressure relief hole 111d is not shown in FIG6). A connecting frame 115 may be provided in the shell 111. An acoustic channel 1151 is provided on the connecting frame 115 for connecting the first pressure relief hole 111c and the rear cavity 116 so that the rear cavity 116 is connected with the external environment, that is, air can freely enter and exit the rear cavity 116, which is beneficial to reduce the resistance of the diaphragm of the transducer 112 during vibration.

FIG. 7 is an exemplary external view of a transducer according to some embodiments of the present specification, and FIG. 8 is an exemplary exploded view of a transducer according to some embodiments of the present specification. Referring to FIG. 7 and FIG. 8, in some embodiments, the sound-generating part 11 may include a diaphragm 1121, a coil 1122, a bracket 1123, a terminal 1124, and a magnetic circuit assembly 1125. Among them, the bracket 1123 provides a mounting and fixing platform, and the speaker 112 may be connected to the housing 111 through the bracket 1123, and the terminal 1124 is fixed to the bracket 1123, and the terminal 1124 may be used for circuit connection (for example, connecting leads, etc.). The coil 1122 is connected to the diaphragm 1121 and is at least partially located in the magnetic gap formed by the magnetic circuit assembly 1125. The magnetic circuit assembly 1125 will generate a force on the energized coil 1122, thereby driving the diaphragm 1121 to generate mechanical vibration, and then generate sound through the propagation of a medium such as air. The magnetic circuit assembly 1125 may include a magnetic conductive plate 11251, a magnet 11252, and a receiving member 11253. The magnetic conductive plate 11251 is located between the magnet 11252 and the diaphragm 1121 and is attached to the surface of the magnet 11252 .

FIG9 is an exemplary internal structure diagram of the sound-emitting part according to some embodiments of the present specification, and FIG10 is an exemplary structure diagram of the diaphragm according to some embodiments of the present specification. The sound-emitting part 11 includes a diaphragm 1121, a coil 1122, a bracket 1123, and a magnetic circuit assembly 1125. Among them, the bracket 1123 is arranged around the diaphragm 1121, the coil 1122, and the magnetic circuit assembly 1125 to provide a mounting and fixing platform. The sound-emitting part 11 can be connected to the housing 111 through the bracket 1123, and the coil 1122 extends into the magnetic circuit assembly 1125 and is connected to the diaphragm 1121. The magnetic circuit assembly 1125 will generate a force on the energized coil 1122, thereby driving the diaphragm 1121 to generate mechanical vibration, and then generate sound through the propagation of a medium such as air, and the sound is output through the sound outlet. In some embodiments, the magnetic circuit assembly 1125 includes a magnetic plate 11251, a magnet 11252 and a container 11253, the magnetic plate 11251 and the magnet 11252 are connected to each other, the side of the magnet 11252 away from the magnetic plate 11251 is installed on the bottom wall of the container 11253, and there is a gap between the peripheral side of the magnet 11252 and the peripheral inner side wall of the container 11253. In some embodiments, the peripheral outer side wall of the container 11253 is connected and fixed to the bracket 1123. In some embodiments, the container 11253 and the magnetic plate 11251 can both be made of magnetic conductive materials (such as iron, etc.). In some embodiments, the peripheral side of the diaphragm 1121 can be connected to the bracket 1123 through a fixing ring 1155. In some embodiments, the material of the fixing ring 1155 can include stainless steel or other metal materials to adapt to the processing and manufacturing process of the diaphragm 1121. Referring to FIG. 8 , the magnetic circuit assembly 1125 may include a magnetic conductive plate 11251, a magnet 11252, and a container 11253. The container 11253 and the magnetic conductive plate 11251 may both be made of magnetic conductive materials (e.g., iron, etc.). In some embodiments, the container 11253 includes a bottom 11253a of the container and a side wall 11253b on the peripheral side. The bottom 11253a and the side wall 11253b of the container form a containing space, and the magnetic conductive plate 11251 and the magnet 11252 are contained in the containing space. The magnetic conductive plate 11251 and the magnet 11252 are connected to each other, and the side of the magnet 11252 away from the magnetic conductive plate 11251 is installed on the bottom 11253a of the container, and there is a gap between the peripheral side of the magnet 11252 and the side wall 11253b on the peripheral side of the container 11253. In some embodiments, the coil 1122 can extend into the gap between the magnet 11252 and the side wall 11253b.

In some embodiments, in order to allow at least part of the coil 1122 to be located in a region with a high magnetic flux density in the magnetic circuit assembly 1125 during the up and down vibration of the diaphragm 1121, so as to improve the magnetic field utilization efficiency of the magnetic circuit assembly 1125, in the vibration direction of the diaphragm 1121, the distance dd between the center point J of the coil 1122 and the center point K of the magnetic conductive plate 11251 is less than 0.3 mm. For example, the center point J of the coil 1122 and the center point K of the magnetic conductive plate 11251 can be substantially on the same horizontal line, so that the magnetic circuit assembly 1125 generates a greater force on the coil 1122 to provide power for the vibration of the diaphragm 1121.

Referring to FIGS. 9 and 10 , in some embodiments, the diaphragm 1121 may include a main body region 11211 and a folding ring region 11212 disposed around the main body region 11211. In some embodiments, the main body region 11211 includes a first inclined section 11211a and a first connecting section 11211b connected to the coil 1122. As shown in FIG. 9 , the first connecting section 11211b is used to connect the coil 1122, and the first connecting section 11211b is disposed parallel to the short axis direction Z and perpendicular to the vibration direction of the diaphragm. The first inclined section 11211a is in contact with a portion of the folding ring region 11212. In some embodiments, the first inclined section 11211a is inclined relative to the first connecting section 11211b in a direction away from the coil 1122. As shown in FIG. 9 and FIG. 10 , the coil 1122 is located at the lower side of the first connecting section 11211b, and the first inclined section 11211a is inclined upward (i.e., away from the direction away from the coil 1122) relative to the first connecting section 11211b. The above arrangement can prevent the glue used for bonding from overflowing into the folding ring area 11212 when the coil 1122 is bonded to the diaphragm 1121 , causing the glue to corrode the folding ring area 11212 and affect the vibration performance of the diaphragm 1121 .

In some embodiments, the magnetic circuit system 1125 mainly includes a magnetic conductive plate 11251, a magnet 11252 and a container 11253. The magnetic conductive plate 11251 and the magnet 11252 are connected to each other. The side of the magnet 11252 away from the magnetic conductive plate 11251 is installed on the bottom wall of the container 11253, and there is a gap between the peripheral side of the magnet 11252 and the inner side wall of the peripheral side of the container 11253. The coil 1122 can extend into the gap between the magnet 11252 and the container 11253. If the distance between the coil 1122 and the side wall of the container 11253 is too large, the coil will not be in the area with a large magnetic flux density of the magnetic circuit assembly 1125, which will weaken the power provided by the magnetic circuit assembly 1125 to the diaphragm 1121; if the distance is too small, the coil 1121 will have the risk of colliding with the container 11253. Therefore, in order to avoid the collision of the coil 1121 and ensure that the magnetic field provides power to the diaphragm 1121, in some embodiments, in the above-mentioned gap, the distance wt between the coil 1122 and the side wall of the magnet 11252 can be 0.1mm-0.25mm, and the distance ww between the coil 1122 and the inner side wall of the peripheral side of the container 11253 can be 0.1mm-0.5mm. In some embodiments, the distance wt between the coil 1122 and the side wall of the magnet 11252 can be 0.12mm-0.24mm, and the distance ww between the coil 1122 and the inner side wall of the peripheral side of the container 11253 can be 0.15mm-0.3mm. In some embodiments, in the above-mentioned gap, the distance wt between the coil 1122 and the side wall of the magnet 11252 can be 0.17mm-0.21mm, and the distance ww between the coil 1122 and the inner side wall of the peripheral side of the container 11253 can be 0.19mm-0.23mm. In some embodiments, the distance wt between the coil 1122 and the side wall of the magnet 11252 may be 0.2 mm, and the distance ww between the coil 1122 and the inner side wall of the peripheral side of the container 11253 may be 0.2 mm. If the distance h3 between the coil 1122 and the bottom 11253a of the container 11253 is too large, the volume of the entire sound-emitting part 11 will increase. If the distance h3 between the coil 1122 and the bottom 11253a of the container 11253 along the vibration direction of the diaphragm 1121 is too small, the coil 1121 may collide with the container 11253. Therefore, in order to avoid the volume of the sound-emitting part 11 being too large and the collision of the coil 1121, in some embodiments, the distance _h3 between the coil 1122 and the bottom 11253a of the container 11253 (i.e., the distance between the end of the coil 1122 away from the diaphragm 1121 and the bottom wall of the container 11253) may be 0.2 mm-4 mm. In some embodiments, the distance _h3 between the coil 1122 and the bottom wall of the container 11253 may be 0.6 mm-3 mm. In some embodiments, the distance _h3 between the coil 1122 and the bottom wall of the container 11253 may be 1 mm-2 mm. In some embodiments, the distance _h3 between the coil 1122 and the bottom wall of the container 11253 may be 1.4 mm-1.6 mm.

In some embodiments, by designing the inclination angle β of the first inclined section 11211a relative to the first connecting section 11211b, the relative position of the coil 1122 and the magnetic circuit assembly 1125 can be changed, so that the thrust received by the coil 1122 is substantially consistent, thereby adjusting the low-frequency distortion of the sound-emitting part 11, and making the low-frequency hearing richer. In addition, by designing the inclination angle β of the first inclined section 11211a relative to the first connecting section 11211b, it is also possible to prevent the coil 1122 from overflowing glue to the folding ring area 11212, avoid corrosion of the folding ring area 11212, and affect the vibration of the folding ring area 11212. Among them, the inclination angle β of the first inclined section 11211a relative to the first connecting section 11211b refers to the angle between the first inclined section 11211a and the straight line where the first connecting section 11211b is located in the direction away from the first connecting section 11211b, as shown in FIG. 10.

In some embodiments, in order to reduce the degree of distortion of the sound-emitting portion 11, avoid corrosion of the folding ring area 11212 and affect the vibration of the folding ring area 11212, the inclination angle β of the first inclined section 11211a relative to the first connecting section 11211b can be in the range of 5°-30°. In some embodiments, in order to further reduce the degree of distortion of the sound-emitting portion 11, the inclination angle β of the first inclined section 11211a relative to the first connecting section 11211b can be in the range of 10°-25°. For example, the inclination angle β of the first inclined section 11211a relative to the first connecting section 11211b can be 15°. For another example, the inclination angle β of the first inclined section 11211a relative to the first connecting section 11211b can be 22°.

In some embodiments, the minimum distance between the coil 1122 and the first inclined section 11212a is not less than 0.3 mm, that is, the distance between the connection point between the first inclined section 11212a and the first connecting section 11211b and the connection area between the coil 1122 and the first connecting section 11211b is not less than 0.3 mm, so that the folding ring area 11212 and the installation position of the coil 1122 maintain a safe distance to prevent the glue used to install the coil 1122 from overflowing into the folding ring area 11212.

In some embodiments, the folding ring area 11212 includes a second inclined section 11212a, and the second inclined section 11212a is at least partially attached to the first inclined section 11211a. The main body area 11211 and the folding ring area 11212 are connected through the first inclined section 11211a and the second inclined section 11212a. In some embodiments, in order to simplify the mounting process, the first inclined section 11211a and the second inclined section 11212a can be connected by glue. In some embodiments, in order to achieve the connection between the main body area 11211 and the folding ring area 11212, the second inclined section 11212a can be arranged on the side of the first inclined section 11211a close to the coil 1122. In some embodiments, in order to achieve the connection between the main body area 11211 and the folding ring area 11212, and to further reduce the corrosion degree of the glue on the folding ring area 11212 when the coil 1122 is bonded, the second inclined section 11212a can be arranged on the side of the first inclined section 11211a away from the coil 1122.

Since the vibration amplitude of the diaphragm 1121 is large at low frequencies, if the folding ring area 11212 adopts a planar structure, its deformation ability is poor, which will affect the vibration amplitude of the diaphragm 1121. Therefore, in order to make the diaphragm 1121 have better deformation ability, in some embodiments, the folding ring area 11212 may include an arc segment 11212c.

In some embodiments, the ratio of the height _h1 to the span _w1 of the arc segment 11212c can affect the deformation ability of the arc segment 11212c. The height of the arc segment 11212c refers to the distance between the highest point of the arc segment 11212c and the lowest point of the arc segment in the vibration direction of the diaphragm 1121. As shown in FIG. 10, the height of the arc segment 11212c is denoted as _h1 . The span of the arc segment 11212c refers to the distance between the highest point of the arc segment 11212c and the lowest point of the arc segment 11212c in the vibration direction of the diaphragm 1121. 11212c. As shown in FIG10 , the span of the arc segment 11212c is recorded as w ₁ . If the ratio of the height h ₁ of the arc segment 11212c to the span w ₁ is too small, the convexity of the arc segment 11212c is too small, and the shape may be close to a planar structure with poor deformation ability. If the ratio of the height h ₁ of the arc segment 11212c to the span w ₁ is too large, the convexity of the arc segment 11212c is too large, and the vibration of the diaphragm 1121 is greatly hindered, which affects the output of the sound-emitting part 11. Therefore, in some embodiments, in order to make the sound-emitting part 11 have better output and lower distortion, the ratio of the height h ₁ of the arc segment 11212c to the span w ₁ can be in the range of 0.35-0.4. In some embodiments, in order to further improve the output of the sound-emitting portion 11, the ratio of the height _h1 of the arc segment 11212c to the span _w1 may be in the range of 0.36-0.39. In some embodiments, in order to further reduce the distortion of the sound-emitting portion 11, the ratio of the height _h1 of the arc segment 11212c to the span _w1 may be 0.37-0.38. For example, the ratio of the height _h1 of the arc segment 11212c to the span _w1 may be 0.38.

In some embodiments, the height _h1 of the arc segment 11212c may be in the range of 0.5mm-0.7mm. For example, the height _h1 of the arc segment 11212c may be in the range of 0.55mm-0.65mm. In some embodiments, the height _h1 of the arc segment 11212c may be 0.6mm. Taking into account the error size, in some embodiments, the height _h1 of the arc segment 11212c may be 0.6mm±0.05mm. In some embodiments, the span (width) w2 of the arc segment 11212c of the folding ring area 11212 may be less than twice the radius of curvature r1. In some embodiments, the radius of curvature r1 of the arc segment 11212c of the folding ring area 11212 may be 0.7mm-0.9mm. In some embodiments, the radius of curvature r1 of the arc segment 11212c of the folding ring area 11212 may be 0.75mm-0.88mm. In some embodiments, the radius of curvature r1 of the arc segment 11212c of the folding ring area 11212 may be 0.8mm-0.83mm. In some embodiments, the span w1 of the arc segment 11212c of the folding ring area 11212 may be 1.2mm-1.7mm. In some embodiments, the span w1 of the arc segment 11212c of the folding ring area 11212 may be 1.3mm-1.65mm. In some embodiments, the span w1 of the arc segment 11212c of the folding ring area 11212 may be 1.5mm-1.6mm. In some embodiments, the radius of curvature r1 of the arc segment 11212c of the folding ring area 11212 may be 0.82mm, and the span w1 of the arc segment 11212c of the folding ring area 11212 may be 1.58mm. Taking the error size into consideration, in some embodiments, the radius of curvature r1 of the arc segment 11212c of the folding ring area 11212 may be 0.82 mm±0.05 mm, and the span w1 of the arc segment 11212c of the folding ring area 11212 may be 1.58 mm±0.1 mm.

In some embodiments, the folding ring area 11212 may also include a wavy structure composed of a plurality of arc segments 11212c, wherein any two adjacent arc segments 11212c face opposite directions. The arrangement of the wavy structure may make the degree of obstruction encountered by the diaphragm 1121 during the vibration process upward and downward as symmetrical as possible, reduce the degree of distortion of the sound-emitting portion 11, and improve the low-frequency output of the sound-emitting portion 11. In some embodiments, the ratio of the height to the span of each arc segment 11212c in the plurality of arc segments 11212c may be consistent with the ratio of the height to the span of the above-mentioned single arc segment 11212c. In some embodiments, the ratio of the height to the span of each arc segment 11212c in the plurality of arc segments 11212c may be different. For example, along the radial direction of the diaphragm 1121, the height of each arc segment 11212c in the plurality of arc segments 11212c may gradually decrease from the center to the edge of the diaphragm 1121, and the span of each arc segment 11212c is the same.

In order to constrain the diaphragm 1121 when it vibrates greatly and prevent the coil 1122 from hitting the magnetic circuit assembly 1125, in some embodiments, the main body region 11211 may include an arched spherical top 11211c located at one end of the first connecting section 11211b away from the first inclined section 11211a, and the arched spherical top 11211c and the arc section 11212c have the same arching direction, that is, the arched spherical top 11211c protrudes toward the side away from the coil 1122. The arched spherical top 11211c can prevent the diaphragm 1121 from shaking when it vibrates greatly, ensuring that the coil 1122 and the magnetic assembly 1125 will not collide. At the same time, the arched spherical top 11211c also has high strength and rigidity, which can suppress the split vibration of the main body region 11211 to a certain extent, thereby improving the high-frequency vibration characteristics of the transducer 112. In the absence of a front cover, the dome aspect ratio (i.e., the ratio of height to span) increases, and the high-frequency bandwidth increases, but an excessively high dome aspect ratio will result in increased unevenness and an increase in overall size.

In some embodiments, the height _h2 of the dome 11211c is related to the dimension of the dome 11211c in the direction of arch extension (i.e., the span dimension _w2 ). The height of the dome 11211c refers to the distance between the highest point of the dome 11211c and the lowest point of the dome 11211c (i.e., the end point connected to the first connecting section 11211b) in the vibration direction of the diaphragm 1121. As shown in FIG10, the height of the dome 11211c is _h2 . The span of the dome 11211c refers to the maximum distance between the two upper points of the dome 11211c. As shown in FIG10, the span of the dome 11211c is _w2 . The larger the span size _w2 of the dome 11211c, the larger the height _h2 of the dome 11211c will be in order to maintain the arched structure of the dome 11211c (for example, so that the curvature corresponding to the dome 11211c is maintained within the preset curvature range), which may cause the overall thickness of the transducer 112 to be too large. Taking into account the overall thickness and structural design of the transducer 112, in some embodiments, the preset curvature range corresponding to the dome 11211c of the main body area 11211 of the diaphragm 1121 may be 0.5263rad-3.1416rad. In some embodiments, the preset curvature range corresponding to the dome 11211c of the main body area 11211 of the diaphragm 1121 may be 0.7869rad-3.1416rad. In some embodiments, the preset curvature range corresponding to the dome 11211c of the main body area 11211 of the diaphragm 1121 may be 1.0526rad-3.1416rad. In some embodiments, the preset curvature range corresponding to the dome 11211c of the main body region 11211 of the diaphragm 1121 may be 1.5789 rad-3.1416 rad. In some embodiments, the preset curvature range corresponding to the dome 11211c of the main body region 11211 of the diaphragm 1121 may be 2.1053 rad-3.1416 rad. In some embodiments, the dome 11211c of the main body region 11211 of the diaphragm 1121 may be 2.1053 rad-3.1416 rad. The corresponding preset curvature range may be 2.6316rad-3.1416rad. In some embodiments, the width dimension w2 of the dome 11211c of the main body area 11211 may be 2mm-8mm. In some embodiments, the width dimension w2 of the dome 11211c of the main body area 11211 may be 3mm-7mm. In some embodiments, the width dimension w2 of the dome 11211c of the main body area 11211 may be 4mm-6mm. In some embodiments, the width dimension w2 of the dome 11211c of the main body area 11211 may be 4.8mm. In some embodiments, the height h2 of the dome 11211c of the main body area 11211 (i.e., the distance between the highest point and the lowest point of the dome 11211c in the vibration direction of the diaphragm) may range from 0.7mm-1.2mm. In some embodiments, the height h2 of the dome 11211c of the main body area 11211 may be 0.9mm-1.1mm. In some embodiments, the height h2 of the spherical top 11211c of the main body region 11211 may be 1 mm-1.05 mm. In some embodiments, the height h2 of the spherical top 11211c of the main body region 11211 may be 0.8 mm. In some embodiments, due to processing errors, the height h2 of the spherical top 11211c of the main body region 11211 may be 0.8 mm±0.08 mm.

In some embodiments, the ratio of the height _h2 of the dome 11211c to the span _w2 may affect the overall size of the sound-emitting portion 11 and the vibration of the diaphragm 1121. If the ratio of the height _h2 of the dome 11211c to the span _w2 is too small, the protrusion of the dome 11211c is too small, the shape of the dome 11211c is close to a planar structure, the strength and rigidity of the dome 11211c are low, and the dome 11211c is prone to split vibration, resulting in more peaks and valleys in the high-frequency region, affecting the high-frequency vibration characteristics of the transducer 112. If the ratio of the height _h2 of the dome 11211c to the span _w2 is too large, the protrusion of the dome 11211c is too large, the overall thickness of the transducer 112 may be too large, and the unevenness and overall size will also increase. Therefore, in order to make the sound-emitting part 11 have an appropriate thickness as a whole and improve the high-frequency vibration characteristics of the sound-emitting part 11, the ratio of the height _h2 of the dome 11211c to the span _w2 can be in the range of 0.1-0.6. In some embodiments, in order to further improve the high-frequency vibration characteristics of the transducer 112, the ratio of the height _h2 of the dome 11211c to the span _w2 can be in the range of 0.1-0.4. In some embodiments, in order to further improve the high-frequency vibration characteristics of the transducer 112, the ratio of the height _h2 of the dome 11211c to the span _w2 can be in the range of 0.1-0.3.

In some embodiments, taking into account the structural strength, the difficulty of process realization and the overall thickness limit of the sound-emitting part 11, and satisfying the maximum amplitude of the diaphragm 1121, so that the diaphragm 1121 does not collide with the magnetic plate 11251 during the vibration process, in the vibration direction of the diaphragm, the distance between the lowest point of the spherical top 11211c of the main body area 11211 of the diaphragm 1121 and the top of the magnetic plate 11251 in the magnetic circuit assembly 1125 (the distance hd shown in FIG. 9 ) can be greater than 0.8 mm. In some embodiments, the distance hd between the lowest point of the spherical top 11211c of the main body area 11211 of the diaphragm 1121 and the top of the magnetic plate 11251 in the magnetic circuit system 1125 can be 0.85 mm-0.95 mm, that is, 0.9 mm±0.05 mm. Among them, 0.9 mm is the structural dimension, and 0.05 mm is the error range dimension. In some embodiments, the distance hd between the lowest point of the spherical top 11211c of the main body region 11211 of the diaphragm 1121 and the top of the magnetic plate 11251 in the magnetic circuit system 1125 can be 0.86 mm-0.93 mm. In some embodiments, the distance hd between the lowest point of the spherical top 11211c of the main body region 11211 of the diaphragm 1121 and the top of the magnetic plate 11251 in the magnetic circuit system 1125 can be 0.88 mm-0.92 mm.

FIG11A is a schematic diagram of an exemplary high-frequency bandwidth of a sound-emitting part according to some embodiments of the present specification. As shown in FIG11A , in the frequency response curve of the sound-emitting part 11, there is a first inflection point f ₀ in the low-frequency region, and f ₀ is approximately around 300 Hz. f ₀ is related to the hardness and softness of the folding area 11212 of the diaphragm 1121 and the vibration weight (mainly the weight of the main body area 11211). The second inflection point f _h is around 25 kHz, and f _h can be determined based on the overall trend of the frequency response curve. After f _h = 25 kHz, although the curve has a small local peak, it shows a downward trend as a whole. The peak values of the frequency band between f ₀ and f _h (i.e., between 300 Hz and 25 kHz) are selected and averaged to form a first reference line L _m , such as the upper straight line in FIG11A . The reference straight line is dropped by 10 dB to form a second straight line L _n (the lower straight line in FIG11A ), which is the selected bandwidth of 100 Hz-45 kHz.

In some embodiments, the frequency of the high-frequency split vibration of the diaphragm 1121 is proportional to E/ρ. Wherein, E is the Young's modulus of the diaphragm 1121, and ρ is the equivalent density of the diaphragm 1121. Therefore, E/ρ can determine the bandwidth of the high frequency. When E is constant, the smaller the mass of the diaphragm 1121, the smaller the equivalent density ρ of the diaphragm 1121, the larger the E/ρ, and the wider the high-frequency bandwidth. When ρ is constant, the larger the Young's modulus E of the diaphragm 1121, the larger the E/ρ, the larger the high-frequency split vibration frequency of the diaphragm 1121, and the wider the high-frequency bandwidth.

In some embodiments, the high-frequency segmentation vibration area of the sound-emitting part 11 refers to the area where the frequency response drops sharply and alternates between peaks and valleys after the frequency response curve reaches the highest peak. As shown in FIG11A , after the frequency response curve reaches the highest peak (i.e., the sound pressure level corresponding to f _h ), the area to the right of f _h where the frequency response drops sharply and alternates between peaks and valleys is the high-frequency segmentation vibration area. The frequency at which the corresponding curve reaches the highest peak is the frequency at which the high-frequency segmentation vibration occurs (f _h as shown in FIG11A ). In some embodiments, in order to avoid large differences in vibrations of different parts in the main body area 11211, resulting in poor high-frequency effects, the frequency of the high-frequency segmentation vibration of the main body area 11211 (ball top 11211c) can be designed so that the diaphragm 1121 has a wider high-frequency bandwidth while reducing the occurrence of high-frequency segmentation vibrations in the bandwidth area. In some embodiments, the frequency of the high-frequency segmentation vibration of the ball top 11211c can be no less than 20kHz. For example, the frequency of the high-frequency segmentation vibration of the ball top 11211c can be no less than 25kHz. In some embodiments, in order to ensure that the output of the main body region 11211 within the effective frequency band is high, the mass of the main body region 11211 needs to be small to reduce the difficulty of vibration of the main body region 11211 within the effective frequency band. Therefore, the material of the main body region 11211 can be selected from materials and structures with lower density and higher strength. Therefore, the Young's modulus of the dome 11211c can be no less than 6GPa. In some embodiments, the Young's modulus of the dome 11211c can be in the range of 6GPa-7GPa. For example, the Young's modulus of the dome 11211c can be 6.5GPa. The Young's modulus of the dome 11211c can be measured by static It can be obtained by measuring using state method or dynamic method (such as pulse excitation method, acoustic resonance method, sound velocity method, etc.).

In some embodiments, the main body area 11211 can be made of carbon fiber material. Figure 11B is a schematic diagram of the weaving structure of exemplary carbon fibers shown in some embodiments of this specification. Carbon fiber materials have low density and high strength, which is conducive to weakening the high-order modes of the speaker 112. In some embodiments, in order to further increase the strength of the main body area 11211 and reduce the equivalent density of the main body area 11211, the main body area 11211 can be formed by interlacing carbon fibers, and at least part of the carbon fibers are interlaced at a first angle. In some embodiments, the first angle is in the range of 45°-90°. For example, the weaving of multiple independent carbon fibers can be interlaced at any angle such as 45°, 60°, 90°, etc. As shown in Figure 11B, multiple carbon fibers 112111 and multiple 112112 can be interlaced at an angle close to 90°. In some embodiments, because the carbon fibers are very thin, multiple carbon fibers 112111 and multiple 112112 can be laid at an angle close to 90° and connected by gluing. In some embodiments, the main body area 11211 may include a structure of interlaced weaving of multiple layers (e.g., 2 layers, 3 layers, etc.) of carbon fibers. In order to facilitate the interlaced weaving of carbon fibers, in some embodiments, the length of a single carbon fiber is not less than 5 mm. In some embodiments, the length of a single carbon fiber may be in the range of 5 mm-10 mm. For example, the length of a single carbon fiber may be 7 mm. Because a single carbon fiber is too thin, it is difficult to weave one by one and is not easy to achieve. In some embodiments, multiple carbon fibers may be laid and connected together (e.g., by gluing, etc.) to form multiple groups of carbon fibers, and the multiple groups of carbon fibers are interlaced in warp and weft.

In some embodiments, in order to reduce the weight of the main body region 11211, the thickness of the main body region 11211 using the super aligned carbon fiber structure can be designed to obtain a selected high frequency bandwidth. In some embodiments, the thickness of the main body region 11211 can be less than 80 μm. In some embodiments, the thickness of the main body region 11211 can be in the range of 10 μm-60 μm. In some embodiments, the thickness of the main body region 11211 can be 25 μm.

FIG12 is a schematic diagram of the amplitude of the sound-emitting part under different driving voltages shown in some embodiments of the present specification. As shown in FIG12, under the same voltage, the diaphragm 1121 of the transducer 112 vibrates in two opposite directions (such as the positive and negative directions of the thickness direction X shown in FIG6, i.e., the positive and negative directions of the ordinate axis in FIG12) with different amplitudes, which is due to the asymmetry of the diaphragm 1121. Wherein, in FIG12, the unit Vrms represents the effective voltage value of the sinusoidal AC signal, for example, 0.7Vrms represents that the effective voltage value of the input sinusoidal AC signal is 0.7V. As shown in FIG12, when the input voltage is in the range of 0.4V-0.7V, the amplitude of the downward (negative direction of the ordinate axis) vibration of the diaphragm 1121 (about 0.8mm) is greater than the amplitude of the upward (positive direction of the ordinate axis) vibration (about 0.6mm). The upward vibration of the diaphragm 1121 refers to the vibration of the diaphragm 1121 toward the front cavity 114, and the downward vibration of the diaphragm 1121 refers to the vibration of the diaphragm 1121 toward the rear cavity 116 (toward the magnetic circuit component 1125). As shown in FIG12 , as the input voltage continues to increase (for example, from 0.7V to 1V), the amplitude of the diaphragm 1121 gradually decreases and eventually approaches the threshold, wherein the amplitude of the downward vibration of the diaphragm 1121 approaches the first threshold (about 0.9mm), and the amplitude of the upward vibration approaches the second threshold (about 0.8mm). Since the amplitude of the downward vibration of the diaphragm 1121 is greater than the amplitude of the upward vibration, the amplitude of the diaphragm 1121 appearing in this specification refers to the larger downward vibration amplitude of the diaphragm 1121. In some embodiments, in order to prevent the coil 1122 from colliding with the magnetic circuit assembly 1125 when the diaphragm 1121 vibrates, the maximum amplitude of the diaphragm 1121 can be limited to no more than 0.8 mm, that is, the amplitude of the diaphragm 1121 can be in the range of 0 mm-0.8 mm. In some embodiments, the amplitude of the diaphragm 1121 can be in the range of 0 mm-0.75 mm. In some embodiments, the amplitude of the diaphragm 1121 can be in the range of 0 mm-0.7 mm.

In some embodiments, within the amplitude range of 0 mm-0.8 mm, the difference in amplitude of the diaphragm 1121 vibrating in two opposite directions (i.e., upward vibration and downward vibration) may be less than 0.05 mm, so as to reduce the distortion of the transducer 112. In some embodiments, in order to further reduce the distortion of the transducer 112, the difference in amplitude of the diaphragm 1121 vibrating in two opposite directions (i.e., upward vibration and downward vibration) may be less than 0.04 mm. In some embodiments, in order to further reduce the distortion of the transducer 112, the difference in amplitude of the diaphragm 1121 vibrating in two opposite directions (i.e., upward vibration and downward vibration) may be less than 0.03 mm.

Please refer to FIG8 and FIG9. In some embodiments, the bracket 1123 is arranged around the magnetic circuit assembly 1125. As shown in FIG9, along the vibration direction of the diaphragm, the bracket 1123 may include a first portion 112311, a second portion 11232 and a third portion 11233. The first portion 112311 refers to the portion between the highest point D of the region where the bracket 1123 is connected to the diaphragm 1121 and the highest point of the region where the bracket 1123 is connected to the container 11253 along the vibration direction of the diaphragm 1121. The second portion 11232 refers to the region where the air vent is provided on the bracket 1123. As shown in FIG9, the second portion 11232 refers to the portion between the highest point of the region where the bracket 1123 is connected to the container 11253 and the side wall where the bottom of the air vent on the bracket 1123 is located (i.e., the bottom 11253a facing the container 11253) along the vibration direction of the diaphragm 1121. The third portion 11233 refers to the portion between the side wall where the bottom of the air hole on the bracket 1123 is located and the bottom of the bracket 1123 close to the magnetic circuit assembly 1125 (i.e., close to the bottom 11253a of the container 11253). As shown in FIG10, a second connecting segment 11212b is provided at one end of the folding ring area 11212 away from the main body area 11211, which is used to connect the bracket 1123. The second connecting segment 11212b is arranged parallel to the short axis direction Z and perpendicular to the vibration direction of the diaphragm. In some embodiments, the first portion 112311 of the bracket 1123 is connected to the second connecting segment 11212b of the folding ring area 11212. In some embodiments, the second connecting segment 11212b of the folding ring area 11212 is connected to the first portion 112311 of the bracket 1123 through a fixing ring 1155 to achieve the fixation of the diaphragm 1121 and the bracket 1123.

FIG. 13 is an exemplary structural diagram of a portion of the back cavity according to some embodiments of the present specification. 13. In some embodiments, a connecting frame 115 may be provided in the shell 111, and a second acoustic cavity may be formed between the connecting frame 115 and the bracket 1123 of the transducer 112, and the second acoustic cavity may serve as a rear cavity 116. The rear cavity 116 is separated from other structures in the shell 111 (such as the main control circuit board, etc.), which is conducive to improving the acoustic performance of the sound-emitting part 11. Among them, the shell 111 is provided with a pressure relief hole (such as a first pressure relief hole 111c and/or a second pressure relief hole 111d), and an acoustic channel 1151 connecting the pressure relief hole and the rear cavity 116 is provided on the connecting frame 115, so that the rear cavity 116 is connected to the external environment, that is, air can freely enter and exit the rear cavity 116, which is conducive to reducing the resistance of the diaphragm 1121 of the transducer 112 during the vibration process.

In some embodiments, the cross section of the rear cavity 116 may be composed of two vertical sides and a curved side, and the two end points of the curved side are connected, so that the cross section (for example, cross section ABC) can be approximately regarded as a triangle. Among them, the hypotenuse AC is composed of the line connecting the two end points formed by the curved surface formed on the connecting frame 115 and the two straight sides of the bracket 1123. In some embodiments, the thickness _h4 of the first part 112311 of the bracket 1123 along the vibration direction of the diaphragm 1121 can affect the volume of the rear cavity 116. When the thickness _h4 of the first part 112311 increases, the volume of the rear cavity 116 decreases while the volume of the entire sound-emitting part 11 remains unchanged; accordingly, when the thickness _h4 of the first part 112311 decreases, the volume of the rear cavity 116 increases. In some embodiments, the thickness of the first part 112311 of the bracket 1123 can affect the volume of the rear cavity 116, thereby affecting the resonant frequency of the rear cavity 116. In some embodiments, the rear cavity 116 may refer to the cavity formed by the rear side of the diaphragm. At this time, the thickness _h4 of the first part 112311 of the bracket 1123 increases, and the volume of the rear cavity 116 increases while the volume of the entire sound-emitting part 11 remains unchanged; correspondingly, the thickness _h4 of the first part 112311 decreases, and the volume of the rear cavity 116 decreases.

In some embodiments, the combination of the rear cavity 116 and the pressure relief holes (e.g., the first pressure relief hole 111c and/or the second pressure relief hole 111d) provided on the shell 111 can be regarded as a Helmholtz resonance cavity model. The rear cavity 116 can be used as the cavity of the Helmholtz resonance cavity model, and the pressure relief holes can be used as the neck of the Helmholtz resonance cavity model. At this time, the resonance frequency of the Helmholtz resonance cavity model is the resonance frequency f ₂ of the rear cavity 116. In the Helmholtz resonance cavity model, the volume of the cavity (e.g., the rear cavity 116) can affect the resonance frequency f of the cavity (e.g., the rear cavity 116). The specific relationship is shown in formula (1):

Wherein, c represents the speed of sound, S represents the cross-sectional area of the neck (eg, the pressure relief hole), V represents the volume of the cavity (eg, the rear cavity 116), and L represents the depth of the neck (eg, the pressure relief hole).

It can be seen from formula (1) that when the cross-sectional area S and the depth L of the pressure relief hole (for example, the first pressure relief hole 111c and/or the second pressure relief hole 111d) remain unchanged, the volume of the rear cavity 116 increases, and the resonant frequency _f2 of the rear cavity 116 decreases, that is, moves to a low frequency.

FIG14 is a frequency response curve of the rear cavity corresponding to different thicknesses of the first portion 112311 shown in some embodiments of the present specification. As shown in FIG14, as the thickness _h4 of the first portion 112311 of the bracket 1123 gradually increases from 0.3 mm to 3 mm, the volume of the rear cavity 116 gradually increases, and the resonance peak of the rear cavity 116 gradually moves toward the low frequency, so that the flat range of the frequency response curve is reduced, affecting the output performance of the sound-emitting part 11.

If the thickness _h4 of the first portion 112311 is too small, the amplitude of the diaphragm 1121 will be limited by the bracket 1123. If the thickness _h4 of the first portion 112311 is too large, the overall size of the sound-emitting portion 11 will be too large, and the resonance peak of the rear cavity 116 will move to a low frequency, which will reduce the flat area of the frequency response curve of the rear cavity 116 and affect the sound quality of the sound-emitting portion 11. The thickness of the first portion 112311 refers to the minimum distance between the connection area of the bracket 1123 and the folding ring area 11212 and the area directly in contact with the magnetic circuit component 1125 in the vibration direction of the diaphragm 1121.

In some embodiments, in order to make the sound-emitting part 112 have a higher low-frequency output and the frequency response curve of the rear cavity 116 have a larger flat area, the thickness _h4 of the first part 112311 of the bracket 1123 can be in the range of 0.3mm-3mm. In some embodiments, in order to further improve the low-frequency output of the transducer 112, the thickness _h4 of the first part 112311 can be in the range of 0.5mm-2mm. In some embodiments, in order to further increase the flat area of the frequency response curve of the rear cavity 116, the thickness _h4 of the first part 112311 can be in the range of 0.8mm-1mm. In some embodiments, the thickness _h4 of the first part 112311 can be 0.9mm, at which time the resonance peak of the rear cavity 116 is near 6.1kHz, the sound-emitting part 11 has a better low-frequency output, and the frequency response curve of the rear cavity 116 has a wider flat area.

In some embodiments, the weight of the transducer 112 is mainly related to the bracket 1123 and the magnetic circuit assembly 1125, wherein the weight of the magnetic circuit assembly 1125 accounts for a relatively large proportion. In some embodiments, the weight of the bracket 1123 increases, and when the material of the bracket 1123 remains unchanged, it indicates that the size of the bracket 1123 increases, which can correspond to the increase in the area of the diaphragm 1121. In some embodiments, the weight of the magnetic circuit assembly 1125 increases, which increases the magnetic induction intensity near the coil 1122 and the driving force generated on the coil, thereby increasing the vibration amplitude of the diaphragm 1121 and making the transducer 112 have higher sensitivity and better low-frequency effect. However, if the weight of the transducer 112 is too large, the weight of the sound-emitting part 11 will be too large, affecting the wearing stability and comfort of the open earphone 10.

Based on the two wearing conditions, that is, the sound-emitting part 11 at least partially covers the antihelix area as shown in FIG. 3 and the sound-emitting part 11 extends entirely or partially into the concha cavity as shown in FIG. 4 , the volume that can be heard by the ear 100 increases (equivalent to a higher sound-emitting efficiency), and therefore The weight of the transducer 112 can be reduced by reducing the size of the diaphragm 1121 or the weight of the magnetic circuit assembly 1125, so that the transducer 112 has higher sensitivity and low-frequency output, while the open-type earphone 10 has higher wearing stability and comfort. In some embodiments, the weight of the transducer 112 can be in the range of 1.1g-3.3g. In some embodiments, in order to further improve the sensitivity and low-frequency output of the transducer 112, the weight of the transducer 112 can be in the range of 1.5g-3g. In some embodiments, in order to further improve the wearing stability and comfort of the open-type earphone 10, the weight of the transducer 112 can be in the range of 2g-2.5g. In some embodiments, the weight of the transducer 112 can be 2.2g.

FIG. 15 is a frequency response curve of the sound-emitting part under different driving voltages according to some embodiments of the present specification. The diaphragm surface of the speaker 112 faces the test microphone at a distance of 4 mm, and a voltage in the range of 0.1V-0.7V is applied to the speaker 112. The test frequency range is set to 20Hz-20000Hz to obtain the frequency response curve of the speaker 112 under different driving voltages (as shown in FIG. 15). Combining FIG. 12 and FIG. 15, when the input voltage is in the range of 0.1V-0.7V and the frequency is in the range of 20Hz-6.1kHz, the amplitude of the diaphragm 1121 is in the range of 0mm-0.8mm. At this time, in order to prevent the vibration of the coil 1122 from contacting the bottom 11253a of the container, the distance _h3 (as shown in FIG. 9) between the bottom of the coil 1122 and the bottom 11253a of the container can be greater than 0.8mm. In some embodiments, in order to reduce the size of the sound-emitting part 11 and improve the comfort of the user when wearing it, the distance h ₃ (as shown in FIG. 9 ) between the bottom of the coil 1122 and the bottom 11253a of the container may not exceed 0.9 mm. Therefore, at an input voltage of 0.1 V to 0.7 V, in the range of 20 Hz to 6.1 kHz, the distance h ₃ (as shown in FIG. 9 ) between the bottom of the coil 1122 and the bottom 11253a of the container may be in the range of 0.8 mm to 0.9 mm.

As shown in FIG15 , as the input voltage gradually increases from 100 mV to 700 mV, the output of the sound-emitting part 11 gradually increases, and the sensitivity gradually increases, but the resonance peak frequency remains basically unchanged, and is located near 6.1 kHz. Based on the two wearing conditions of the sound-emitting part 11 at least partially covering the antihelix area as shown in FIG3 and the sound-emitting part 11 extending into the concha cavity as a whole or in part as shown in FIG4 , by controlling the distance h ₃ (as shown in FIG9 ) from the bottom of the coil 1122 to the bottom of the receiving part 11253a within the range of 0.8 mm to 0.9 mm, the sound-emitting part 11 has a higher sensitivity. As shown in FIG15 , when the input voltage is 100 mV-700 mV, at a frequency of 1 kHz, the sound pressure level (SPL) of the sound-emitting part 11 is within the range of 85 dB-103 dB.

In some embodiments, as can be seen from the foregoing, the thickness _h4 of the first part 112311 of the bracket 1123 is in the range of 0.3mm-3mm. When the thickness _h4 of the first part 112311 increases to 3mm, the corresponding resonant frequency _f2 of the rear cavity 116 decreases to 3.3kHz, which reduces the range of the flat area and affects the sound quality. In some embodiments, in order to increase the range of the flat area and improve the sound quality of the sound-emitting part 11, the thickness _h4 of the first part 112311 can be less than 3mm, and the resonant frequency _f2 of the rear cavity 116 can be not less than 3.3kHz. In some embodiments, in order to further improve the sound quality of the sound-emitting part 11, the resonant frequency _f2 of the rear cavity 116 can be not less than 3.5kHz. In some embodiments, in order to further improve the sound quality of the sound-emitting part 11, the resonant frequency _f2 of the rear cavity 116 can be not less than 4kHz. In some embodiments, in order to further improve the sound quality of the sound-emitting part 11, the resonant frequency _f2 of the rear cavity 116 can be not less than 6kHz.

In some embodiments, according to formula (1), the volume of the rear cavity 116 may affect the resonant frequency f ₂ of the rear cavity 116. And the volume of the rear cavity 116 is affected by the thickness h ₄ of the first portion 112311 of the bracket 1123. The value range of the volume of the rear cavity 116 may be determined by the value range of the thickness h ₄ of the first portion 112311 and the value range of the resonant frequency f ₂ of the rear cavity 116. In some embodiments, the volume of the rear cavity 116 may be 60 mm ³ -110 mm ³ .

FIG16 is a schematic diagram of exemplary positions of a bracket and a first pressure relief hole and a second pressure relief hole according to some embodiments of the present specification. As shown in FIG16 , in some embodiments, a plurality of air holes 11231 are provided on the bracket 1123. The provision of the air holes 11231 allows the sound on the back of the diaphragm 1121 to be transmitted to the rear cavity 116 and the pressure relief hole through the plurality of air holes 11231 and propagate to the outside world, providing a good channel for radiating sound on both sides of the diaphragm 1121.

In some embodiments, in order to better balance the airflow and balance the air pressure in the rear cavity 116, the multiple air holes 11231 can be designed asymmetrically. For example, with the short axis of the bracket 1123 as the center, the multiple air holes 11231 can be set asymmetrically. Specifically, the bracket 1123 is provided with a first air hole 11231a and a second air hole 11231b. As shown in FIG. 16, the distance La between the center of the first air hole 11231a and the center of the second pressure relief hole 111d is greater than the distance Lb between the center of the second air hole 11231b and the center of the second pressure relief hole 111d. In some embodiments, the air pressure in the rear cavity 116 is relatively high at a position farther from the second pressure relief hole 111d. Therefore, in order to balance the air pressure in the rear cavity 116, the area of the first air hole 11231a is greater than the area of the second air hole 11231b. That is to say, in order to balance the air pressure in the rear cavity 116, the area of the air hole closer to the second pressure relief hole 111d (or the first pressure relief hole 111c) is smaller, and the area of the air hole farther from the second pressure relief hole 111d (or the first pressure relief hole 111c) is larger. Among them, the distance between the air hole 11231 and the pressure relief hole refers to the distance between the center of the air hole 11231 and the center of the corresponding pressure relief hole. In this specification, the center of the air hole or the pressure relief hole refers to the geometric center of the hole-like structure.

In the rear cavity 116, at a position far from the first pressure relief hole 111c and/or the second pressure relief hole 111d, the air pressure is relatively high, so the area of the air hole 11231 can be set larger; at a position close to the first pressure relief hole 111c and/or the second pressure relief hole 111d, the air pressure is relatively low, so the area of the air hole 11231 can be set smaller. If the areas of the multiple air holes 11231 are the same, the air pressure is relatively high at the position far from the first pressure relief hole 111c and/or the second pressure relief hole 111d in the rear cavity 116, and since the air holes 11231 at this position are relatively large, the pressure at the position far from the first pressure relief hole 111c and/or the second pressure relief hole 111d is relatively high. The area of the air hole 11231 is small, and the air pressure in the rear cavity 116 cannot be well balanced, which will cause the diaphragm 1121 to experience greater air resistance when vibrating. Similarly, at the position near the first pressure relief hole 111c and/or the second pressure relief hole 111d in the rear cavity 116, the diaphragm 1121 experiences less resistance when vibrating. As a result, the diaphragm 1121 is subjected to uneven force, making the vibration of the diaphragm 1121 unstable. Therefore, by adjusting the area of the air hole 11231, the low-frequency vibration of the sound-emitting part 11 can be made more stable.

In some embodiments, since the air holes 11231 can balance the air pressure in the rear cavity 116 and affect the uniformity of the air resistance encountered by the diaphragm 1121 when it vibrates, the total area of the air holes 11231 can affect the output performance of the sound-emitting part 11. And the ratio of the total area of the plurality of air holes 11231 to the projected area of the diaphragm 1121 along the vibration direction can affect the air resistance when the diaphragm 1121 vibrates. If the ratio of the total area of the plurality of air holes 11231 to the projected area of the diaphragm 1121 along the vibration direction is too small, the air pressure in the rear cavity 116 will be relatively high, and the air resistance encountered by the diaphragm 1121 when it vibrates will be relatively high, affecting the low-frequency output performance of the diaphragm 1121. When the ratio of the total area of the plurality of air holes 11231 to the projected area of the diaphragm 1121 along the vibration direction reaches a certain threshold, the ratio is increased, and the influence of the air in the rear cavity 116 on the vibration of the diaphragm 1121 is weakened, and the structural strength of the bracket will be affected. Therefore, in some embodiments, in order to make the diaphragm 1121 experience uniform and small air resistance when vibrating, and to ensure good output performance of the sound-emitting part 11, the ratio of the total area of the plurality of air holes 11231 to the projected area of the diaphragm 1121 along the vibration direction may be in the range of 0.008-0.3. In some embodiments, in order to further reduce the air resistance experienced by the diaphragm 1121 when vibrating, the ratio of the total area of the plurality of air holes 11231 to the projected area of the diaphragm 1121 along the vibration direction may be in the range of 0.1-0.25. In some embodiments, in order to further reduce the air resistance experienced by the diaphragm 1121 when vibrating, the ratio of the total area of the plurality of air holes 11231 to the projected area of the diaphragm 1121 along the vibration direction may be in the range of 0.11-0.23.

FIG. 17 is a frequency response curve of the rear cavity corresponding to different total areas of air holes according to some embodiments of the present specification. Among them, the different total areas of the air holes 11231 can be achieved by using plasticine to block the air holes 11231. The diaphragm surface of the speaker 112 faces the test microphone at a distance of 4 mm, a voltage of 0.4 V is applied to the speaker 112, and the test frequency range is set to 20 Hz-20000 Hz to obtain the frequency response curve of the speaker 112 under different air hole areas (as shown in FIG. 17). Among them, 0 ^mm2 refers to the situation where the air holes 11231 are completely blocked, that is, there is no hole on the bracket. As shown in FIG. 17, as the total area of the air holes 11231 gradually increases from 0 ^mm2 to 4.54 ^mm2 , the frequency response curve of the rear cavity 116 gradually moves up in the low frequency (e.g., 100 Hz-1000 Hz) area, that is, the low frequency response of the rear cavity 116 gradually increases. When the total area of the air holes 11231 gradually increases from 4.54 mm ² to 12.96 mm ² , the low-frequency response of the rear cavity 116 does not change significantly. This is because when the total area of the air holes 11231 increases to a certain area (for example, 4.54 mm ² ), under low-frequency vibration, the influence of the air in the rear cavity 116 on the vibration of the diaphragm 1121 gradually weakens. Therefore, even if the total area of the air holes 11231 is further increased, the influence on the frequency response curve of the low-frequency region of the rear cavity 116 is not significant.

As shown in FIG. 17 , as the total area of the air holes 11231 gradually increases from 0 mm ² to 12.96 mm ² , the resonance peak of the rear cavity 116 gradually moves toward the high frequency, and the frequency response curve of the low frequency region (e.g., 100 Hz-1000 Hz) gradually tends to be flat. In some embodiments, in order to make the rear cavity 116 have a good low frequency response, the total area of the sound-transmitting holes 11231 can be in the range of 4.54 mm ² -12.96 mm ^2. In some embodiments, in order to make the rear cavity 116 have a good low frequency response, the total area of the sound-transmitting holes 11231 can be in the range of 5 mm ² -11 mm ^2. In some embodiments, in order to make the rear cavity 116 have a good low frequency response, the total area of the sound-transmitting holes 11231 can be in the range of 7 mm ² -10 mm ^2. In some embodiments, in order to make the rear cavity 116 have a good low frequency response, the total area of the sound-transmitting holes 11231 can be in the range of 8 mm ² -10 mm ² .

In some embodiments, in order to improve the structural strength, a plurality of air holes 11231 may be provided on the bracket 1123, and the connecting parts between the plurality of air holes 11231 form reinforcing ribs. In some embodiments, in order to simplify the hole opening process, the number of air holes 11231 may also be set to only one, while the total area of the air holes 11231 is satisfied.

In some embodiments, a plurality of air holes may be provided on the bottom 11253a or the side wall 11253b of the container 11253 of the magnetic circuit assembly 1125. The sound on the back of the diaphragm 1121 may be transmitted to the rear cavity 116 and the pressure relief hole through the plurality of air holes, and the air holes provide a good channel for radiating sound on both sides of the diaphragm 1121.

In some embodiments, the projection area of the diaphragm 1121 in the vibration direction will affect the amount of air pushed by the diaphragm 1121 when it vibrates, thereby affecting the efficiency of the diaphragm 1121 in generating sound by vibration, and affecting the acoustic output effect of the sound-emitting part 11. If the projection area of the diaphragm 1121 in the vibration direction is too small, the amount of air pushed by the diaphragm 1121 when it vibrates will be small, and the acoustic output effect of the sound-emitting part 11 will be poor. If the projection area of the diaphragm 1121 in the vibration direction is too large, the size of the bracket 1123 will be too large, thereby increasing the weight of the bracket 1123, making the weight of the sound-emitting part 11 larger, affecting the structure and weight of the sound-emitting part 11, and affecting the wearing comfort and stability. Combined with the two wearing conditions of at least partially covering the antihelix area of the sound-emitting part 11 shown in FIG. 3 and the whole or part of the sound-emitting part 11 extending into the concha cavity shown in FIG. 4, the volume that can be heard by the ear 100 increases (equivalent to higher sound efficiency), so the size of the diaphragm 1121 does not need to be too large. In some embodiments, the sound outlet 111a is arranged on the side wall of the shell 111 of the sound-emitting part 11 close to the ear of the user, and the sound outlet 111a is arranged on the front side of the diaphragm 1121 and is connected to the front cavity 114. The vibration direction of the diaphragm 1121 is or is approximately equal to the thickness direction X of the sound-emitting part 11. The projection area of the diaphragm 1121 in the vibration direction is or is approximately equal to the projection area of the diaphragm 1121 in the sagittal plane. The projection area of the diaphragm 1121 in the vibration direction can affect the projection of the sound-emitting part 11 on the sagittal plane of the user. The overlapping ratio of the projection area of the sound-emitting part 11 on the user's sagittal plane and the projection area of the concha cavity on the sagittal plane can affect the cavity-like structure formed by the sound-emitting part 11 extending into the concha cavity, thereby affecting the acoustic output effect of the sound-emitting part 11. Furthermore, the long-axis size and short-axis size of the diaphragm 1121 can affect the long-axis size and short-axis size of the projection of the sound-emitting part 11 on the sagittal plane.

In some embodiments, considering the two situations that the sound-emitting part 11 shown in FIG. 3 at least partially covers the antihelix area and the sound-emitting part 11 shown in FIG. 4 entirely or partially extends into the concha cavity, in order to enable the sound-emitting part 11 to have a good acoustic output and the projection of the sound-emitting part 11 on the sagittal plane has a suitable area or the sound-emitting part 11 has a suitable thickness, the projection area of the diaphragm 1121 in the vibration direction may be 90 mm ² -560 mm ² . Preferably, the projection area of the diaphragm 1121 in the vibration direction may be 120 mm ² -300 mm ² . More preferably, the projection area of the diaphragm 1121 in the vibration direction may be 150 mm ² -200 mm ² .

Taking into account the above two situations that the sound-emitting part 11 at least partially covers the antihelix area as shown in FIG. 3 and the sound-emitting part 11 as a whole or partially extends into the concha cavity as shown in FIG. 4, in order to make the diaphragm 1121 have as large an area as possible within the limited size of the sound-emitting part 11, thereby enhancing the acoustic output performance of the sound-emitting part 11, in some embodiments, when the vibration direction of the diaphragm 1121 is parallel to the thickness direction X of the sound-emitting part 11, the ratio of the projection area of the diaphragm 1121 in the diaphragm vibration direction (i.e., the projection area of the diaphragm 1121 on the sagittal plane) to the projection area of the shell 111 in the diaphragm vibration direction (i.e., the projection area of the shell 111 on the sagittal plane) may be not less than 0.5. In some embodiments, in order to make the diaphragm 1121 have as large an area as possible within the limited size of the sound-emitting part 11, thereby enhancing the acoustic output performance of the sound-emitting part 11, the ratio of the projection area of the diaphragm 1121 in the diaphragm vibration direction to the projection area of the shell 111 in the diaphragm vibration direction may be not less than 0.8. In some embodiments, the diaphragm 1121 is made to have as large an area as possible to enhance the acoustic output performance of the sound-emitting part 11, and the ratio of the projected area of the diaphragm 1121 in the diaphragm vibration direction to the projected area of the shell 111 in the diaphragm vibration direction can be in the range of 0.8-0.95.

In some embodiments, in combination with the wearing method in which the sound-emitting part 11 at least partially covers the antihelix area as shown in FIG. 3, the long axis size of the diaphragm 1121 may be in the range of 13 mm-25 mm, and the short axis size of the diaphragm may be in the range of 4 mm-13 mm. In combination with the wearing method in which the sound-emitting part 11 extends in its entirety or in part into the concha cavity as shown in FIG. 4, in order to facilitate the whole or in part of the sound-emitting part 11 to extend into the concha cavity to form an effective cavity-like body, the short axis size of the diaphragm 1121 may be in the range of 4 mm-13 mm. On the basis of the above-mentioned short axis size, based on the projection area of the diaphragm 1121 (for example, the projection area of the diaphragm 1121 in the vibration direction is in the range of 52 mm ² -325 mm ² ), the long axis size of the diaphragm 1121 is further determined to be in the range of 13 mm-25 mm. For example, the long axis size of the diaphragm 1121 may be in the range of 15 mm-20 mm, and the short axis size of the diaphragm may be in the range of 5 mm-10 mm. For another example, the major axis dimension of the diaphragm 1121 may be in the range of 17 mm-18 mm, and the minor axis dimension of the diaphragm may be in the range of 7 mm-8 mm.

The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and/or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

In addition, it will be appreciated by those skilled in the art that various aspects of the present application may be illustrated and described by a number of patentable categories or situations, including any new and useful process, machine, product or combination of substances, or any new and useful improvements thereto. Accordingly, various aspects of the present application may be performed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above hardware or software may all be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". In addition, various aspects of the present application may be represented as a computer product located in one or more computer-readable media, the product including computer-readable program code.

A computer storage medium may include a propagated data signal containing computer program code, for example, in baseband or as part of a carrier wave. The propagated signal may be in a variety of forms, including electromagnetic, optical, etc., or a suitable combination. A computer storage medium may be any computer-readable medium other than a computer-readable storage medium, which can be connected to an instruction execution system, device or apparatus to communicate, propagate or transmit the program for use. The program code on the computer storage medium may be transmitted via any suitable medium, including radio, cable, fiber optic cable, RF, or similar media, or any combination of the above media.

The computer program code required for the operation of each part of the present application can be written in any one or more programming languages, including object-oriented programming languages such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB.NET, Python, etc., conventional procedural programming languages such as C language, Visual Basic, Fortran 2003, Perl, COBOL 2002, PHP, ABAP, dynamic programming languages such as Python, Ruby and Groovy, or other programming languages. The program code can be completely executed on the user's computer. The software may be run on the user's computer, or as a stand-alone software package, or partly on the user's computer and partly on a remote computer, or entirely on a remote computer or processing device. In the latter case, the remote computer may be connected to the user's computer via any form of network, such as a local area network (LAN) or wide area network (WAN), or connected to an external computer (e.g., via the Internet), or in a cloud computing environment, or used as a service such as software as a service (SaaS).

In addition, unless expressly stated in the claims, the order of the processing elements and sequences described in this application, the use of alphanumeric characters, or the use of other names are not intended to limit the order of the processes and methods of this application. Although the above disclosure discusses some invention embodiments that are currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of this application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing processing device or mobile device.

Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values is as accurate as possible within the feasible range.

Each patent, patent application, patent application disclosure, and other materials, such as articles, books, instructions, publications, documents, etc., cited in this application are hereby incorporated by reference in their entirety. Except for application history documents that are inconsistent with or conflicting with the content of this application, documents that limit the broadest scope of the claims of this application (currently or later attached to this application) are also excluded. It should be noted that if the descriptions, definitions, and/or use of terms in the attached materials of this application are inconsistent or conflicting with the content described in this application, the descriptions, definitions, and/or use of terms in this application shall prevail.

Finally, it should be understood that the embodiments described in this application are only used to illustrate the principles of the embodiments of the present application. Other variations may also fall within the scope of the present application. Therefore, as an example and not a limitation, the alternative configurations of the embodiments of the present application may be considered to be consistent with the teachings of the present application. Accordingly, the embodiments of the present application are not limited to the embodiments explicitly introduced and described in this application.

Claims

A vocal part, comprising:

Diaphragm;

magnetic circuit components; and

A coil, the coil is connected to the diaphragm and is at least partially located in the magnetic gap formed by the magnetic circuit assembly, and the coil drives the diaphragm to vibrate to generate sound when energized, wherein:

The diaphragm includes a main body area and a folding ring area arranged around the main body area, the main body area includes a first inclined section and a first connecting section connected to the coil, the first inclined section is in contact with a partial area of the folding ring area, and the first inclined section is inclined relative to the first connecting section in a direction away from the coil.
The sound-emitting part according to claim 1 is characterized in that the folded ring area includes a second inclined section, and the second inclined section is at least partially in contact with the first inclined section.
The sound-emitting part according to claim 2 is characterized in that the second inclined section is located on a side of the first inclined section away from the coil.
The sound-emitting part according to claim 1 is characterized in that the folded ring area includes an arc segment, and the ratio of the height of the arc segment to the span of the arc segment is in the range of 0.35-0.4.
The sound-emitting part according to claim 1 is characterized in that an inclination angle of the first inclined section relative to the first connecting section is in the range of 5°-30°, and the first connecting section is perpendicular to the vibration direction of the diaphragm.
The sound-emitting part according to claim 4 is characterized in that the main body area includes a dome, the dome is located at an end of the first connecting section away from the first inclined section, the span of the dome is in the range of 2mm-8mm, and the height of the dome is in the range of 0.7mm-1.2mm.
The sound-emitting part according to claim 6 is characterized in that the ratio of the height of the dome to the span is in the range of 0.1-0.3.
The sound-emitting part according to claim 6 is characterized in that the frequency at which the high-frequency split vibration occurs is not less than 20 kHz.
The sound-emitting part according to claim 1 is characterized in that the magnetic circuit assembly includes a container, and under an input voltage of 0.1V-0.7V, the distance from the bottom of the coil to the bottom of the container is in the range of 0.8mm-0.9mm in the frequency range of 20Hz-6.1kHz.
The sound-emitting part according to claim 1 is characterized in that it also includes a bracket arranged around the magnetic circuit assembly, and the first part of the bracket is connected to the second connecting section of the folding ring area.
The sound-emitting part according to claim 10 is characterized in that the second connecting section of the folding ring area is connected to the first part of the bracket through a fixing ring.
The sound-emitting part according to claim 10 or 11 is characterized in that the thickness of the first part where the bracket is connected to the folding ring area is in the range of 0.3mm-3mm, and the thickness of the first part is the minimum distance between the connection area between the bracket and the folding ring area and the area where the bracket is directly in contact with the magnetic circuit assembly in the vibration direction of the diaphragm.
The sound-emitting part according to claim 12 is characterized in that it also includes a shell, a pressure relief hole is provided on the shell, a rear cavity is formed between the pressure relief hole and the back side of the diaphragm, and the resonance frequency of the rear cavity is not less than 3.3 kHz.
The sound-emitting part according to claim 13, characterized in that the volume of the rear cavity is in the range of 60 mm 3 -110 mm 3 .
The sound-emitting part according to claim 10 is characterized in that it also includes a shell, the shell is provided with a pressure relief hole, the bracket is provided with a plurality of air holes, the sound on the back of the diaphragm is transmitted to the pressure relief hole through the plurality of air holes, the plurality of air holes include at least a first air hole and a second air hole, the distance between the center of the first air hole and the center of the pressure relief hole is greater than the distance between the center of the second air hole and the center of the pressure relief hole, and the area of the first air hole is greater than the area of the second air hole.
The sound-emitting part according to claim 10 is characterized in that it also includes a shell, the shell is provided with a pressure relief hole, the bracket starts with a plurality of air holes, the sound from the back of the diaphragm is transmitted to the pressure relief hole through the plurality of air holes, and in the vibration direction of the diaphragm, the ratio of the total area of the plurality of air holes to the projected area of the diaphragm is in the range of 0.008-0.3.
The sound-emitting part according to claim 16, characterized in that, in the vibration direction of the diaphragm, the projection area of the diaphragm is in the range of 90 mm 2 -560 mm 2 , and the total area of the plurality of air holes is in the range of 4.54 mm 2 -12.96 mm 2 .
The sound-emitting part according to claim 1 is characterized in that it also includes a shell, and in the vibration direction of the diaphragm, the ratio of the projected area of the diaphragm to the projected area of the shell is not less than 0.5.
The sound-emitting part according to claim 18 is characterized in that, in the vibration direction of the diaphragm, the ratio of the projected area of the diaphragm to the projected area of the shell is in the range of 0.8-0.95.
The sound-emitting part according to claim 18 is characterized in that the major axis dimension of the diaphragm is in the range of 13 mm to 25 mm, and the minor axis dimension of the diaphragm is in the range of 4 mm to 13 mm.
The sound-emitting part according to claim 10 is characterized in that a plurality of air holes are provided on the bottom wall of the container of the magnetic circuit assembly or on the side wall in contact with the bracket.
The sound-emitting part according to claim 6 is characterized in that the dome is formed by interlacing carbon fibers, and at least part of the carbon fibers are interlaced at a first angle, and the first angle is in the range of 45°-90°.
The sound-emitting part according to claim 6 is characterized in that, in the vibration direction of the diaphragm, the thickness of the dome is less than 80 um.
The sound-emitting part according to claim 1 is characterized in that a minimum distance between the coil and the first inclined section is not less than 0.3 mm.
The sound-emitting part according to claim 1 is characterized in that the magnetic circuit assembly includes a magnetic conductive plate and a magnet, the magnetic conductive plate is located between the magnet and the diaphragm and attached to the surface of the magnet, and in the vibration direction of the diaphragm, the distance between the center of the coil and the center of the magnetic conductive plate is less than 0.3 mm.
The sound-emitting part according to claim 23 is characterized in that, in the vibration direction of the diaphragm, the distance from the lowest point of the spherical top to the upper surface of the magnetic conductive plate is greater than 0.8 mm.
The sound-emitting part according to claim 1 is characterized in that the magnetic circuit assembly includes a container, and in the vibration direction of the diaphragm, the distance between the bottom of the coil and the bottom wall of the container is in the range of 0.2 mm-4 mm.
The sound-emitting part according to claim 27 is characterized in that the distance between the coil and the side wall of the receiving member is in the range of 0.1 mm to 0.5 mm.